Radio loud speaker



Jan. 1, 1929. 1,697,642

v F. GLOS RADIO LOUD SPEAKER Filed Feb. 8, 1927 Eur l.

E ID. .3

O O T773 1 l i i I i i {7V /4 i 6 5 L I "VI/8 NTO FREDERICK 51- 0s,

Patented Jan. 1, 1929.

I UNITED STATESAPATENT 1,697,642 OFFICE.

FREDERICK GLOS, or BELL, CALIFORNIA.

RADIO LOUD SPEAKER.

This invention relates to devicesto be used in connection with radio transmissions.

One of the objects of this invention is to provide means by which a sound-box can be applied to the side of a phonograph cabinet, piano cabinet, or the like instrument.

Another object is to provide a supporting bracket for a sound-box with adjusting means for axially adjusting the sound-box.

Another object is to provide adjusting and supporting means for the sound-box supporting bracket embodying means for lateral adjustments.

Other objects will appear from the following description and appended claims as well as from the accompanying drawing, in which- Fig. 1 is a side elevation of a phonograph cabinet in a general outline, having a supporting bracket with a sound-box illustrated in a proper'position in relation to one side of the cabinet in accordance with this inven tion.

Fig. 2 is a fragmentary side elevation of a supporting bracket with a diaphragm attachment and adjustments for a sound-box and the arm partly in cross-section to illustrate a cooperating relation of the adjustments to the several parts of the attachment.

Fig. 3 is a front side view of the base plate for the supporting bracket with an outline of the bracket base in dotted lines to illustrate the adjustability in several lateral directions between the bracket and the base plate.

In radio receiving units the diaphragm of the sound-box is normally under a certain tension tightly incased in the sound-box;

Any transmission of a sound from the diaphragm to any cooperating diaphragm or sound reproducing surface must normally be provided under the consideration of conforming with the required tension of the transmitting diaphragm. A suitable adjustment must therefore be provided, by which the-sound-box may be set and adjusted very carefully and accurately to avoid a counteracting of the required tension of the transmitting diaphragm, when such diaphragm 1S connected to a sound magnifying second diaphragm or surface.

As illustrated in Fig. 2, the sound transmitting diaphragm 4 in thesound-box 5 is provided with a connecting rod 6 to the free end? of which a connecting plate 8 has been applied. This connecting plate 8 is formed to be applied or secured to a magnifying or amplifying diaphragm or other sound re producing surface indicated at 9.

The sides of a phonograph cabinet or the sound-board as well as the casing of a piano comprise good and suitable sound magnifying and amplifying mediums. However, as stated above, the sound transmitting dia phragm4 must be maintained under a certain tension regardless of additional attachments to not counteract the sound transmitting capacity of the diaphragm. ,In this case a guide ring 10 is disposed around the soundbox 5 which allows an axial shifting of the sound-box within the ring 10. A yoke 11 projects from the ring 10 over the rear of the sound-box through the center of which a set screw is adjustably disposed. This set screw 1 12 is turnably shouldered Within the casing of the sound-box, as indicated at 13, which allows a drawing and pushing of the soundbox in relation tothe yoke 11 within the guide ring 10, whereby the diaphragm 4 can be carefully and accurately adjusted in relation to the sound magnifying and amplifying diaphragm or surface 9.

The ring 10 forms a part of a bracket 14 which is provided with a base 15. The base 15 is provided with slots 16 and adjusting screws 17. A base plate 18 is provided with slots 19 crosswise to the slots 16 in the base 15 in combination with which the bracket 14 can be adjusted in lateral directions up and down as well as sidewise.

The whole structure described above is illustrated as attached to one side of the phonograph cabinet, indicated at 20 in Fig. 1.

With this attachment any layman can apply the bracket with great accuracy to any sound magnifying or amplifying board or surface, as to music instruments, or hardwood floors and the like.

The connecting plate 8 and the base plate 18 may be fastened or secured to such sound magnifying or amplifying surface and the bracket may then be adjusted in lateral directions to assure a straight and squarely pointing connection in the wire or bar 6 between the transmitting diaphragm 4 and the amplifying diaphragm at 9, and, after a straight and proper setting of the connecting wire or bar 6 has been assured, the tightness of this wire or bar may be adjusted by the set screw 12.

Having thus described my invention, I claim: 7

1. In combination with a sound-box, a

bracket having a guide inuwhich the said sound-box may slide axially and means foraxially adjusting the sound-box within the bracket, and a base on the bracket with slots in one direction and a mounting member with other slots in crosswise relation to, the first: named slots by which the bracket and therewith the inserted sound-box may be adjusted laterally.

2. A soundbox supporting bracket embodying a ring member to slidingly encircle a sound-box, a yoke member projecting at right angles from the one side of the ringmember, a set screw threadedly disposed through the said yoke member at a point to bring the axis of the screw concentric to the said ring member, and a connecting'base on the bracket.

3,. Inoombinat-ion with asoundbox, a,

plate in lateral-directions back and forth and cross-wise thereto.

In testimony that I claim the foregoing as my invention I have signed my name.

FREDERICK GLOS. 

